Hitachi 42EDT41 with/ green pixels randomly flickering on screen
You mentioned that the y sus board voltages need adjustment to correct this problem. Have you done this procedure on this model? Is there anything else that you are aware that could cause this problem? It looks like I may have a bad capacitor (C84) on the y sus board. I ordered the service manual today. Thanks for any help you can provide.
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If the unit has not previously had the PSU or Y-SUS boards replaced prior to this issue. Then it sounds like the voltages are off on one of those two boards. There is a process for checking those voltages and trying to adjust them. If those boards were recently replaced I would say the tech did not check voltage accuracy. But if it just happened out of no where go with the Y-SUS board as the problem. I say that because the unit powers on.
This is a common plasma tv problem. I changed the Y-sustain board and the Z-sustain board and that fixed my "sound, but no picture" problem. You can find both boards on ebay; the Y-sus board is around $100 and the Z-sus is around $50. Hope this helps.
Usually it is the Y-sus that has the problem. This is one of the boards that sustain the picture on the screen.
For this particular issue, there could also be issues with the y-drives and Z-sus. The way to find out for sure is to take the voltages (Va, Vs, Vcc, etc) on the boards and matching them up with the specified values on the panel.
i had this problem to,
what i did to fix mine, take the back off and find the ysus board there are pots on the y sus board that you can adjust with a screw driver mine has 4 on it i adjusted the the two more accessible ones and the problem is gone
alot of voltage adjustments at that high voltage are likely from another source that develops it like the the swith-mode power supply
upstream on power supply board that feeds it ..look for burnt resistors in this case..
I bet your in the wrong circuit but u can test all wires and pins coming in for 200 volts.
get a schamatic of it and find a good tech if u dont know what i am saying.